If it's taco night at your place and you don't have any premade hard shells. Thanks to a tip from culinary weblog Eating Well you can just bake regular floppy flour tortillas in your oven.

Eating Well recommends that work with 6 tortillas at a time—wrap them in a slightly damp cloth or paper towel and microwave for 30 seconds to steam the tortillas. Coat both sides of the tortillas with cooking spray and drape each tortilla over two bars of your oven rack and bake at 375 degrees Fahrenheit until crispy, which should be 7-10 minutes.

The next time taco night rolls around, instead of serving the same old pre-made hard shelled tacos, …
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I personally never cared for hard shell tacos, but my kids like them so I've always shelled out for the processed corn hard shells that are ¼ broken when you open the box. Not anymore, beween this tip and the taco bowl tip I'm out of the buying overpriced preformed tortilla shapes market for good!